Sheet1

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Current for Calculating Trip Time 166 AmpI2 for calculating trip time 20 Amp%I2 12.04819277 % of FLCK 8 ConstantIeq 175.3738863 Amp

166 AmpIeq / IƟ 1.056469195 RatioTe1 30 MinutesTe2 30 MinutesTe3 53 MinutesThermal Element Trip Time 14.20539267 Minutes

I2 12TIME 25

I (Thermal Trip Setting)Ɵ

Sheet1

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Calculation of Thermal State of Motor (Pre-Fault)

Normal Running Current (=I1) 160healthy I2 1.5Running current (Ieq) 160.0562401Healthy (Ieq/I )Ɵ 0.964194218Time lapsed since Start 1000Time Constant for Motor 35

Running Thermal state of Motor ( )Ɵ 0.929670489

Assumed constant

Assumed as 35min